package com.htstar.ovms.gateway.handler;

import com.htstar.ovms.common.core.constant.CacheConstants;
import com.htstar.ovms.common.core.constant.SecurityConstants;
import com.wf.captcha.ArithmeticCaptcha;
import lombok.AllArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.core.io.ByteArrayResource;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.StringRedisSerializer;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Component;
import org.springframework.util.FastByteArrayOutputStream;
import org.springframework.web.reactive.function.BodyInserters;
import org.springframework.web.reactive.function.server.HandlerFunction;
import org.springframework.web.reactive.function.server.ServerRequest;
import org.springframework.web.reactive.function.server.ServerResponse;
import reactor.core.publisher.Mono;

import java.util.concurrent.TimeUnit;

/**
 * @author ovms
 * @date 2018/7/5
 * 验证码生成逻辑处理类
 */
@Slf4j
@Component
@AllArgsConstructor
public class ImageCodeHandler implements HandlerFunction<ServerResponse> {
    private static final Integer DEFAULT_IMAGE_WIDTH = 100;
    private static final Integer DEFAULT_IMAGE_HEIGHT = 40;
    private final RedisTemplate redisTemplate;

    @Override
    public Mono<ServerResponse> handle(ServerRequest serverRequest) {
        ArithmeticCaptcha captcha = new ArithmeticCaptcha(DEFAULT_IMAGE_WIDTH, DEFAULT_IMAGE_HEIGHT);

        String result = captcha.text();

        //保存验证码信息
        String randomStr = serverRequest.queryParam("randomStr").get();
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        redisTemplate.opsForValue().set(CacheConstants.DEFAULT_CODE_KEY + randomStr, result
                , SecurityConstants.CODE_TIME, TimeUnit.SECONDS);

        // 转换流信息写出
        FastByteArrayOutputStream os = null;
        try {
            os = new FastByteArrayOutputStream();
            captcha.out(os);
            //todo
        } catch (Exception e) {
            os.close();
        }

        return ServerResponse
                .status(HttpStatus.OK)
                .contentType(MediaType.IMAGE_JPEG)
                .body(BodyInserters.fromResource(new ByteArrayResource(os.toByteArray())));
    }
}
